diff --git a/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfiguration.java b/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfiguration.java
index 625c50f..4cefa34 100644
--- a/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfiguration.java
+++ b/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfiguration.java
@@ -11,7 +11,7 @@ public class SourcesGeneratorConfiguration {
 	public String currentVersion;
 	public Map<String, InterfaceDataConfiguration> interfacesData;
 	public Map<String, VersionConfiguration> versions;
-	public Map<String, Object> refs = new HashMap<>();
+	public SourcesGeneratorConfigurationRefs refs;
 
 	public static class InterfaceDataConfiguration {
 		public Set<String> extendInterfaces = new HashSet<>();
diff --git a/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfigurationRefs.java b/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfigurationRefs.java
new file mode 100644
index 0000000..01ca0f2
--- /dev/null
+++ b/src/main/java/it/cavallium/data/generator/SourcesGeneratorConfigurationRefs.java
@@ -0,0 +1,15 @@
+package it.cavallium.data.generator;
+
+import it.cavallium.data.generator.SourcesGeneratorConfiguration.ClassConfiguration;
+import it.cavallium.data.generator.SourcesGeneratorConfiguration.CustomTypesConfiguration;
+import it.cavallium.data.generator.SourcesGeneratorConfiguration.VersionTransformation;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class SourcesGeneratorConfigurationRefs {
+	public Map<String, Set<String>> superTypes;
+	public Map<String, CustomTypesConfiguration> customTypes;
+	public Map<String, ClassConfiguration> classes;
+	public List<VersionTransformation> transformations;
+}